EP0011570B1 - Die Ladungsübertragung in einem Halbleiter verwendende Filtervorrichtung - Google Patents
Die Ladungsübertragung in einem Halbleiter verwendende Filtervorrichtung Download PDFInfo
- Publication number
- EP0011570B1 EP0011570B1 EP79400865A EP79400865A EP0011570B1 EP 0011570 B1 EP0011570 B1 EP 0011570B1 EP 79400865 A EP79400865 A EP 79400865A EP 79400865 A EP79400865 A EP 79400865A EP 0011570 B1 EP0011570 B1 EP 0011570B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- filter
- charge transfer
- charge
- capacities
- weighting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000004065 semiconductor Substances 0.000 title claims description 12
- 239000000758 substrate Substances 0.000 claims description 14
- 230000000737 periodic effect Effects 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 description 22
- 238000001914 filtration Methods 0.000 description 11
- 235000021183 entrée Nutrition 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 241001644893 Entandrophragma utile Species 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H15/00—Transversal filters
- H03H15/02—Transversal filters using analogue shift registers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C27/00—Electric analogue stores, e.g. for storing instantaneous values
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
Definitions
- the present invention relates to a filtering device using the transfer of electrical charges in a semiconductor.
- weighted charge quantities are generally read differently and this differential signal constitutes the electrical output signal of the device.
- the transverse charge transfer filters are used in particular as low-pass and band-pass filters.
- a frequency response curve defined in a rigorous manner in particular with regard to the attenuation provided by the filter in a given frequency band and outside this band, with regard to the ripple residual in bandwidth, and the slope of the transition zone towards the bandwidth, the number of weighting coefficients and therefore of stages of the shift register must be greatly increased.
- a transverse charge transfer filter comprising 500 stages has thus been described in an article in the American review “I.E.E. Journal of Solid-State circuits •, volume SC 11, pages 75 to 84 of February 1976.
- transverse charge transfer filters are therefore their size. It should also be noted that when the number of stages becomes large, practically when it exceeds fifty, the performances obtained with these filters no longer correspond to those predicted by theory.
- the alogic filters are switched capacitor filters, which each comprise one or more amplifiers composed solely of capacitors and MOS transistors operating in switching mode, and the transverse charge transfer filter a all of its positive weights and does not have a differential amplifier.
- the transfer function of a transverse charge transfer filter only includes transmission zeros and no poles.
- the two analog filters used only play an additional role and do not, in particular, make it possible to decrease the number of zeros of the transversal filter required to carry out a given filtering, and therefore to decrease the number of stages of the cross filter.
- FIG. 1 represents an embodiment of the device according to the invention.
- Two analog filters 1 are connected in series with a transverse charge transfer filter 2, downstream and upstream thereof.
- two analog filters 1 are shown, but the invention applies to cases where one or more analog filters are connected in series with a transverse charge transfer filter.
- the invention covers all the relative position modes of the charge transfer filter and of the analog filter or filters.
- the analog filters must be at least second order to be able to reduce, in a given frequency band, the attenuation provided by the charge transfer filter, at its sampled input voltage E 1 .
- the loss, Aff is, by definition, 20 log lo (input voltage / output voltage).
- an analog filter constituted in a known manner by a network of resistors, inductors and capacitors, processes an analog signal, as opposed to digital filters, such as charge transfer filters, which process samples of the signal analog to filter.
- Analog filters can also be produced by combining one or more active amplifiers, using bipolar or MOS type transistors, and networks of resistors and capacitors.
- Each resistor can also be replaced by a combination of two MOS transistors operating in switching mode and with a capacity, the filters thus produced are called filters with switched capacities.
- filters have been described in particular in the American review “IEEE Journal of Solid-State Circuits Volume SC 12 Number 6, of December 1977, pages 592 to 608.
- FIG. 1 an embodiment of an analog filter is shown. 1, of the second order, with switched capacities.
- the weighting means are constituted by weighting electrodes 20 inserted in the shift register R with the electrodes transfer 30. Each weighting electrode is divided into at least two elementary electrodes separated according to the direction of charge transfer by a cut-off, a weighted amount of charge can therefore be collected under each elementary electrode.
- a single transfer electrode is interposed between each weighting electrode and each weighting electrode is divided into two elementary electrodes.
- the reading means are constituted in a known manner by two devices for reading the charges in current or in voltage Dp and D N.
- These devices convert the charges into output voltage, and. are coupled to two collection lines Lp and L N of the quantities of weighted charges of two elementary electrodes of each weighting electrode.
- the means fixing the sign of the weighting coefficients and the means of summing the quantities of weighted loads comprise a unit gain differential amplifier 4 receiving the signals from the charge reading devices and supplying the output signal S 1 of the charge transfer filter.
- the transfer and weighting electrodes ensure on periodic application of given potentials, respectively ⁇ 1 and ⁇ 2 , the charge transfer in the substrate.
- the potential ⁇ 2 can be applied to the elementary electrodes under which charges are taken via the reading devices, Dp and D N.
- the means of injection and discharge of the charges are symbolically represented and identified by 5 and 6.
- Figures 2a, b, c, d show curves schematically showing the variations in the attenuation provided by two analog filters, a transverse charge transfer filter and a device according to the invention comprising these two filters in series with the filter with charge transfer, as a function of the ratio f / f c , f being the operating frequency and f c the cut-off frequency of the device.
- the analog filters decrease in the frequency band b, FIGS. 2a and b, the attenuation brought by the charge transfer filter at its sampled input voltage, FIG. 2c.
- Analog filters increase the attenuation due to the transverse charge transfer filter outside the band b. Outside of band b, the weakening of the device is very high and greater than 40 decibels.
- FIG. 3 represents an embodiment of a transverse charge transfer filter with positive weighting coefficients.
- a weighted charge quantity is collected under one of the elementary electrodes of each weighting electrode 20 by a collection line L, constituting the means for summing the transverse filter.
- the means for reading the quantities of electrical charges and the means fixing the sign of the weighting coefficients are constituted by a device for reading the charges, in current or in voltage D, coupled to the collection line, and providing the electrical output signal. of the fife.
- the device D receives a clock signal H of the same frequency as the signals ⁇ 1 , and ⁇ 2 .
- a transverse charge transfer filter with positive weighting coefficients has the advantage of not having a differential amplifier, which is always difficult to integrate.
- FIG. 4 represents an embodiment of an amplifier which can be used in an analog filter with switched capacities, such as the amplifier 3 represented in FIG. 1.
- the gain of the amplifier is substantially equal to 2.
- This amplifier has two capacitors C 1 and C 2 which are periodically switched in parallel and in series by MOQ transistors operating in switching mode. The same voltage E 2 simultaneously charges the capacitors switched in parallel and an amplified voltage is obtained between the extreme terminals A and B of the capacitors switched in series.
- the two capacities are switched in parallel by the MOS transistors T 11 , and T 12 , connected by their drain and their source between on the one hand the extreme terminal A of the capacity C 1 , and a terminal of the capacity C 2 other than the extreme terminal B and on the other hand the input where a voltage E 2 is applied and by the MOS transistor T, 3 , connected by its drain and its source, between a terminal of the capacitor Ci other than the extreme terminal A and the mass.
- the extreme terminal B is connected directly to the ground.
- the two capacitors are switched in series by a MOS transistor T 2 connected by its drain and its source between the terminals of the two capacitors other than the extreme terminals A and B.
- the two groups of MOS transistors, T 11 , T 12 , T, 3 , and T 2 are controlled by periodic signals ⁇ 3 and ⁇ 4 applied to their gates and such that the two groups are not simultaneously conductive.
- a MOS transistor T 3 controlled by switching by a periodic signal ⁇ 5 applied to its gate.
- the transistor T 3 is made conductive during the time interval when the capacitors are switched in series by the signal ⁇ 4 to allow the transfer of the amplified voltage from the terminal A to the point F.
- a capacitor C 20 can be connected between point F and mass. It allows the amplified voltage S 2 to be maintained at point F and the gain of the amplifier to be adjusted.
- the voltage S 2 at F after the conduction of T 3 is written in the case where the two capacitors have the same value C:
- a gain amplifier greater than 2 is easily produced by increasing the number of capacitors to be switched such as Ci and C 2 in FIG. 4 and the number of transistors, such as T 2 , T 11 , T 12 , T 13 , used to perform the switching.
- An amplifier with switched capacitors such as that described above, can be easily integrated on the same semiconductor substrate since it consists only of capacitors and MOS transistors.
- a switched capacity filter comprising one or more switched capacity amplifiers can therefore be easily integrated.
- Another advantage of switched capacity amplifiers is their very stable, well-defined gain and low consumption.
- the two capacitances C 1 and C 2 of the switched capacitor amplifier can be confused with one of the capacitors belonging to the network of capacitors and MOS transistors connected to each amplifier.
- the amplifier shown in Figure 4 can be completed pa. a follower assembly, constituted for example by a single transistor or by a looped differential amplifier.
- the device according to the invention can be fully integrated on the same semiconductor substrate in the embodiments where the analog filters can be integrated.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Ceramic Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Filters That Use Time-Delay Elements (AREA)
- Networks Using Active Elements (AREA)
- Solid State Image Pick-Up Elements (AREA)
Claims (9)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7832765A FR2442546A1 (fr) | 1978-11-21 | 1978-11-21 | Dispositif de filtrage utilisant le transfert de charges electriques dans un semi-conducteur |
FR7832765 | 1978-11-21 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0011570A1 EP0011570A1 (de) | 1980-05-28 |
EP0011570B1 true EP0011570B1 (de) | 1982-06-30 |
Family
ID=9215119
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP79400865A Expired EP0011570B1 (de) | 1978-11-21 | 1979-11-14 | Die Ladungsübertragung in einem Halbleiter verwendende Filtervorrichtung |
Country Status (5)
Country | Link |
---|---|
US (1) | US4356463A (de) |
EP (1) | EP0011570B1 (de) |
JP (1) | JPS5574231A (de) |
DE (1) | DE2963272D1 (de) |
FR (1) | FR2442546A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4508975A (en) * | 1982-09-28 | 1985-04-02 | Rca Corporation | Pulse duration modulator using charge coupled devices |
CN100439926C (zh) * | 2006-03-31 | 2008-12-03 | 北京万工科技有限公司 | 用于洛高夫斯基(Rogowski)线圈的积分器及其实现方法 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL7202070A (de) * | 1972-02-17 | 1973-08-21 | ||
US3877056A (en) * | 1973-01-02 | 1975-04-08 | Texas Instruments Inc | Charge transfer device signal processing system |
DE2630085C3 (de) * | 1975-07-21 | 1978-07-13 | Hughes Aircraft Co., Culver City, Calif. (V.St.A.) | CCD-Transversalfilter |
US4099197A (en) * | 1976-08-12 | 1978-07-04 | Northern Telecom Limited | Complementary input structure for charge coupled device |
JPS5330819A (en) * | 1976-09-03 | 1978-03-23 | Hitachi Ltd | Picture-quality adjusting device of television receiver set |
US4195273A (en) * | 1976-10-29 | 1980-03-25 | Hughes Aircraft Company | CTD charge subtraction transversal filter |
FR2389899B1 (de) * | 1977-05-06 | 1981-11-06 | Thomson Csf | |
DE2838096A1 (de) * | 1978-08-31 | 1980-03-13 | Siemens Ag | Integrierte filterschaltung |
US4205283A (en) * | 1978-10-10 | 1980-05-27 | The United States Of America As Represented By The Secretary Of The Army | Signal delay system |
-
1978
- 1978-11-21 FR FR7832765A patent/FR2442546A1/fr active Granted
-
1979
- 1979-11-14 EP EP79400865A patent/EP0011570B1/de not_active Expired
- 1979-11-14 DE DE7979400865T patent/DE2963272D1/de not_active Expired
- 1979-11-20 JP JP15055579A patent/JPS5574231A/ja active Pending
- 1979-11-21 US US06/096,328 patent/US4356463A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
FR2442546A1 (fr) | 1980-06-20 |
DE2963272D1 (en) | 1982-08-19 |
EP0011570A1 (de) | 1980-05-28 |
JPS5574231A (en) | 1980-06-04 |
US4356463A (en) | 1982-10-26 |
FR2442546B1 (de) | 1982-06-25 |
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